著者らはオフィスにおいて各執務者に個別の明るさを提供する知的照明システムの研究、開発を行っている。知的照明システムは、照明が照度センサの照度に及ぼす影響度合い(以下、照度/光度影響度係数)を導入先オフィスで事前に計測し、その値を用いて適切に照明光度を変化させる。しかし、照度/光度影響度係数の計測は知的照明システムの普及における障害である。また、頻繁に照度/光度影響度係数の計測を行うことはできない。本稿では、照度/光度影響度係数ではなく、照明と照度センサの配置図を基に照明光度を適切に変化させる手法を提案する。オフィスにおける照度/光度影響度係数の計測の必要をなくし、知的照明システムの導入容易性向上を狙う。検証実験を行い、本提案手法を用いたシステム制御の有効性を示した。The authors have conducted research and development of an Intelligent Lighting System to realize individual illuminance environment in an office for each office worker. In the Intelligent Lighting System, we first measure an influence factor of luminance against illuminance measured by illuminance sensors (illuminance/luminance influence factor) at the installation office, and the system properly changes the lighting's luminance by using the factor. However, the measurement of the illuminance/luminance influence factor is obstacle to disseminate the Intelligent Lighting System. Moreover, repeated measurements of the illuminance/luminance influence factor are not practical. In this paper, we proposed a method to change the lighting's luminance properly based on a layout plan of the lightings and illuminance sensors by without using the illuminance/luminance influence factor. Using the proposed method, the measurement of illuminance/luminance influence factor in the office would not be required, which allows easier installation of the Intelligent Lighting System. We also confirmed the effectiveness of the proposed method by a verification experiment in this study.